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1 StorNext 5 release Release Notes Release Supported Product StorNext 5 Date May 2017 Contents What's New in StorNext 5 release Purpose of this Release 3 New Features and Enhancements in StorNext 5 release Fixed Issues and Enhancements Addressed in StorNext StorNext Compatibility 4 Quantum Operating System Upgrade Support Policy 4 StorNext and Linux Interoperability 4 Supported StorNext Upgrade Paths and Upgrade Considerations 5 StorNext Software Upgrade Matrix Quantum Corporation. All rights reserved. Your right to copy this manual is limited by copyright law. Making copies or adaptations without prior written authorization of Quantum Corporation is prohibited by law and constitutes a punishable violation of the law. Artico, Be Certain (and the Q brackets design), DLT, DXi, DXi Accent, DXi V1000, DXi V2000, DXi V4000, DXiV-Series, FlexSpace, FlexSync, FlexTier, Lattus, the Q logo, the Q Quantum logo, Q-Cloud, Quantum (and the Q brackets design), the Quantum logo, Quantum Be Certain (and the Q brackets design), Quantum Vision, Scalar, StorageCare, StorNext, SuperLoader, Symform, the Symform logo (and design), vmpro, and Xcellis are either registered trademarks or trademarks of Quantum Corporation and its affiliates in the United States and/or other countries. All other trademarks are the property of their respective owners. Products mentioned herein are for identification purposes only and may be registered trademarks or trademarks of their respective companies. All other brand names or trademarks are the property of their respective owners. Quantum specifications are subject to change Rev A, May 2017

2 Considerations for the StorNext File System Directories 5 Journal Size Guidelines 5 Distributed Data Mover (DDM) Guidelines 5 Considerations When Upgrading NFS Server Nodes to StorNext 5 6 Database Schema Update During Upgrades 6 Compatibility Between StorNext and Other Products 7 NAS 7 Infiniband 7 Lattus 7 Partial File Retrieval 7 StorNext Web Services 8 Apple Xsan 8 Supported Browsers 8 General Considerations 8 Checksum Performance Considerations 8 Upgrading Appliances 9 Known Issues 9 StorNext File System Known Issues 9 StorNext Storage Manager Known Issues 12 StorNext GUI Known Issues 15 StorNext Installation, Replication, HA, and Other Known Issues 18 Contacting Quantum 21 StorNext 5 release Release Notes 2

3 What's New in StorNext 5 release What's New in StorNext 5 release Purpose of this Release The StorNext release is a collection of important software fixes that solve several customer-facing issues. See Fixed Issues and Enhancements Addressed in StorNext on the next page for a complete list of the issues addressed by StorNext New Features and Enhancements in StorNext 5 release Compatibility and Support The StorNext 5 Compatibility Guide provides the basic compatibility for StorNext 5 release The StorNext 5 Compatibility Guide includes the StorNext components supported, operating systems and service packs, libraries and drives, browsers, virtual machines, and appliance support. Listed below are just a few of the types of information available to you in the StorNext 5 Compatibility Guide. Upgrade Paths: Provides information on what upgrades to this release are supported. Appliance Support: Provides information on what StorNext and Lattus appliances are supported with this release or are compatible with it. Operating Systems and Platforms: Provides information on what StorNext components run on various operating systems and service packs. Also includes which operating systems have been newly added or removed. Client Interoperability: Provides information on what StorNext clients running other versions of StorNext are compatible with metadata-controllers (MDCs) running this release. Virtual Machine Support: Provides information on what StorNext components running on selected operating systems and service packs are supported in virtual machines. Compatibility with Other Products: Provides information on references to additional StorNext soldseparately product that are supported with this release. Browser Support: Provides information on what versions of browsers are supported with the GUI in this release. Drives and Libraries: Provides information on what Quantum and 3rd party drives and libraries are supported with this release. StorNext 5 release Release Notes 3

4 StorNext Compatibility Fixed Issues and Enhancements Addressed in StorNext Operating System Change Service Description All File system objects are created without SNEA attribute leading to unprotected files and rename problems. See Product Alert 48 for additional details. All , , Tool needed to detect and fix StorNext Storage Manager regression Change See Product Alert 48 for additional details. StorNext Compatibility For information on StorNext 5 compatibility with operating systems, kernel versions, hardware platforms, drives, libraries, StorNext Appliances, StorNext client interoperability, and other compatibility items, see the StorNext 5 Compatibility Guide. SNAPI and Partial File Retrieval information is provided in separate documents. Quantum Operating System Upgrade Support Policy StorNext supports any security or functional bug update that applies to the current StorNext-supported Red Hat update level or SuSE Linux Service Patch. StorNext does not support upgrading to an update level or service patch beyond the currently supported levels shown in the StorNext 5 Compatibility Guide available online at StorNext and Linux Interoperability Newer versions of the Linux tail command leverage the inotify mechanisms within Linux. The inotify mechanisms in Linux are not triggered by file updates coming from other StorNext nodes. When using the tail command on files located in StorNext, Quantum recommends using the following option: ---disable-inotify StorNext 5 release Release Notes 4

5 Supported StorNext Upgrade Paths and Upgrade Considerations Recommended usage: tail ---disable-inotify -f filename Supported StorNext Upgrade Paths and Upgrade Considerations StorNext Software Upgrade Matrix For information on which StorNext versions allow you to upgrade directly to this release, refer to the StorNext Software Upgrade Matrix section in the StorNext 5 Compatibility Guide available online at Considerations for the StorNext File System Directories On upgrades to StorNext 5, it may be noted that the attributes of many directories in the StorNext file system show much smaller sizes, even zero sizes, where these same directories showed non-zero sizes in StorNext 4.x. This is expected behavior. Journal Size Guidelines The absolute minimum Journal Size in StorNext 5 is 4 MB. If a file system is configured with a Journal Size smaller than 4 MB, the Journal Size must be increased prior to upgrading. The recommended Journal Size is 64 MB. New file systems must have a Journal Size of 64 MB or larger. Distributed Data Mover (DDM) Guidelines Distributed Data Movers (DDMs) must be upgraded to the same version of StorNext that the Metadata Controller (MDC) is running. WARNING: Upgrades (such as platform, service pack, etc.) are intended to be done to all systems present in a given deployment. For example, if Xcellis, M660, M440, Pro Foundation, Artico, and G300 are present, they all must be upgraded. One appliance cannot be "left behind". StorNext 5 release Release Notes 5

6 Supported StorNext Upgrade Paths and Upgrade Considerations Considerations When Upgrading NFS Server Nodes to StorNext 5 Due to the fact that the full 64-bit inode numbers are exposed to Linux after Linux clients are upgraded to StorNext 5, special consideration must be made for Linux NFS servers. To prevent issues with mounted NFS clients, NFS clients must be unmounted prior to upgrading StorNext on the NFS server. If unmounting all NFS clients is not an option during the upgrade, Quantum suggests using the "compat32" mount option on NFS servers. Database Schema Update During Upgrades Database schema updates are applied to Storage Manager when upgrading from StorNext 4.3.x and StorNext 4.7.x to StorNext 5. The M660 appliance can achieve approximately one hour for every hundred million entries in the filecomp tables. Smaller appliances and software only configurations may take considerably longer depending on CPU speed and memory availability. Note: The database schema update conversion time from StorNext 4.7.x to StorNext 5 is significantly faster than that from StorNext 4.3.x to StorNext 5. StorNext file systems are accessible while the database schema is being updated, but Storage Manager functionality (including stores and retrieves) will be offline. Do NOT interrupt StorNext services while the database is being updated. Interrupting the database schema update could result in an inconsistent database, and may require assistance from Quantum Support to repair or restore the database. Use the following commands to determine the number of filecomp entries on the StorNext primary node: 1. List the managed filesystems configured. mysql -e "select Device_key, Path from tmdb.devdb_v;" 2. For each <Device_key> number listed, display a count of the number of entries in the corresponding filecomp table: mysql -e "select count(*) from tmdb.filecomp<device_key>;" Note: The query in Step 2 might require a significant amount of time. Quantum recommends you execute the query before the day of an upgrade. StorNext 5 release Release Notes 6

7 Compatibility Between StorNext and Other Products Compatibility Between StorNext and Other Products See the following sections for information regarding compatibility between this release and StorNext components and features. NAS below Infiniband below Lattus below Partial File Retrieval below StorNext Web Services on the next page Apple Xsan on the next page Supported Browsers on the next page NAS To view supported StorNext NAS software configurations, see the StorNext NAS Compatibility Guide available online at Infiniband StorNext 5 works with Infiniband SRP (SCSI RDMA Protocol) attached storage for Linux and Windows 2008R2. Lattus Refer to the Lattus Release Notes for information about compatibility between Lattus and StorNext Object Storage documentation is available online at Partial File Retrieval StorNext Partial File Retrieval (PFR) is a product which enables you to quickly retrieve and utilize segments of large media files, rather than the entire file, based on time-code parameters. StorNext 5 release Release Notes 7

8 General Considerations Note: For Quantum Cloud Storage, PFR is not supported for copies with client-side encryption or compression. It is only supported for copies with server-side encryption or without encryption and compression. For information about compatibility between PFR and StorNext , see the StorNext Partial File Retrieval Compatibility Guide available online at StorNext Web Services StorNext Web Services enables you to run third-party application program interfaces (APIs) with StorNext. To view the latest commands supported by the StorNext Web Services, refer to the StorNext 5 Web Services Guide available online at Apple Xsan Xsan is software that enables multiple Mac computers to concurrently access hundreds of terabytes of content on Xserve RAID or Promise RAID storage over high-speed Fibre Channel which allows you to share data faster and consolidate projects. Quantum supplements this solution with StorNext data management software, enabling Apple Xsan customers to use applications running on Windows, Linux, and UNIX with their Xsan and share content across more systems. For information about compatibility between Apple Xsan and StorNext , refer to the StorNext 5 Compatibility Guide available online at Supported Browsers For information on browsers supported with the StorNext GUI for this release, refer to the StorNext 5 Compatibility Guide available online at General Considerations This section provides information about items to consider for StorNext 5 release Checksum Performance Considerations Note: Generating MD5 checksums is a CPU intensive operation. StorNext 5 release Release Notes 8

9 Upgrading Appliances Current StorNext metadata controller and Mover hardware is able to calculate MD5 checksums at around 300 MB/s to 500 MB/s. For newer generation tape technology, the maximum throughput may exceed the rate at which the system can generate checksums. In this case, the MD5 checksum calculation will define the throughput of a single data movement operation. With multiple movement streams, MD5 calculations will be done in parallel across the streams and aggregation of performance will be seen. Upgrading Appliances For instructions on upgrading your firmware, refer to the current Release Notes for your particular appliance: For Xcellis, see For Artico, see For M660, M440, M330 Metadata Appliance and Pro Foundation, see For G300 Gateway Appliance, see Known Issues The following sections list known issues in this release of StorNext, as well as associated workarounds, where applicable: StorNext File System Known Issues below StorNext Storage Manager Known Issues on page 12 StorNext GUI Known Issues on page 15 StorNext Installation, Replication, HA, and Other Known Issues on page 18 Note: If you encounter one or more of the issues listed in this section, please contact Quantum Customer Support and report the issue(s) you encountered. Also inform the support representative whether you were able to successfully work around the issue(s) by using the provided workaround. Doing these things will help Quantum prioritize the order in which known issues are addressed in future StorNext releases. StorNext File System Known Issues Table 1 on the next page lists known issues specific to the StorNext File System process. StorNext 5 release Release Notes 9

10 Table 1: StorNext File System Known Issues Operating System Change Service Description/Workaround All , If a file is being copied to the StorNext file system using Windows Explorer and Windows Explorer crashes before it finishes copying all the data, the file may contain data blocks from old, deleted files. This problem occurs because Windows Explorer sets EOF to the size of the file before it writes the data to the file. This leaves a gap of uninitialized data in the file. Note: This problem can also occur with other programs that set EOF beyond the end of data. This problem does not occur if Windows Explorer encounters an error while writing the file; Windows Explorer will delete the partially written file. To prevent this problem from occurring on StorNext, you can use the StorNext "client configuration" application's advanced mount option "Restrict Pre-allocation API" on Window systems and the "protect_ alloc=yes" mount option on Linux systems. This option will set the unwritten parts of the file to zero. When this option is set, non-root users are unable to use the preallocation ioctl. This option also implies sparse=yes. For more information on this option, see the man page mount_cvfs(8). The sparse option will introduce some overhead when using Windows Explorer. Before setting the protect_alloc option, see the sparse option in mount_cvfs(8) for a description of how it changes StorNext behavior. All n/a See Conditions for Mounting an Xsan Volume as a StorNext Distributed LAN Client (DLC) below. Conditions for Mounting an Xsan Volume as a StorNext Distributed LAN Client (DLC) Beginning with Apple's OS X El Capitan (10.11), support is provided to mount Xsan volumes as StorNext DLC clients. This section provides additional information which should clarify the conditions necessary for this mount to succeed. When the StorNext services are loaded, the environment is scanned to determine the default mount type - storage area network (SAN) with access to data disks, or DLC with proxy access to data disks through a StorNext gateway node. If a fibre channel card is detected or internet Small Computer Systems Interface (iscsi) logical unit numbers (LUNs) are present, the default mode is SAN. If neither or these conditions are true, the default mode is DLC. StorNext 5 release Release Notes 10

11 In the case that a SAN mount is attempted and not all data LUNs for the file system are present, the mount fails and no error message is logged. If a DLC mount is desired, there are several ways to accomplish this. First, if the presence of iscsi LUNs is causing the SAN mount attempt, and these LUNs are not needed, the iscsi targets can be disconnected. If this is done, the StorNext service must be unloaded and loaded to detect the change. Example of unload and load: sh-3.2# launchctl unload /System/Library/LaunchDaemons/com.apple.xsan.plist sh-3.2# launchctl load -w /System/Library/LaunchDaemons/com.apple.xsan.plist If iscsi LUNs or a fibre channel card are present, the DLC mount is accomplished by indicating this to the driver. There are two ways to achieve this: Set the Xsan Preferences Payload "preferdlc" for the Volume that is to be DLC Mounted below Set the diskproxy=client Mount Options in the /etc/fstab File below Set the Xsan Preferences Payload "preferdlc" for the Volume that is to be DLC Mounted Example of setting preferdlc payload and verifying: sh-3.2# defaults read /Library/Preferences/com.apple.xsan { enablespotlightserver = 1; } sh-3.2# defaults write /Library/Preferences/com.apple.xsan preferdlc '(snfs1)' sh-3.2# defaults read /Library/Preferences/com.apple.xsan { enablespotlightserver = 1; preferdlc = ( snfs1 ); } For more information on the preferdlc payload and Xsan configuration profiles, see Set the diskproxy=client Mount Options in the /etc/fstab File An alternative way to indicate to the driver that a DLC mount is desired to set the diskproxy=client mount options in the /etc/fstab file. Example of the diskproxy=client mount options in /etc/fstab file: sh-3.2# cat /etc/fstab LABEL=snfs1 none acfs rw,diskproxy=client sh-3.2# In either of the above scenarios, a driver unload and load must be performed to enact the change. Once the Volume is mounted, its status as a DLC client can be verified by using the sub-command who of the cvadmin CLI. First select the file system, then enter who. Look for the C after the CLI in the client entry. StorNext 5 release Release Notes 11

12 Example of the cvadmin who sub-command: Xsanadmin (snfs1) > select snfs1 Xsanadmin (snfs1) > who Who (File System "snfs1") # acfs I.D. Type Location Up Time License Expires > FSM smw-rhel64.mdh.quantum.com 4d 23h 33m N/A 4> 50569B3B7F CLI S smw-rhel64.mdh.quantum.com 4d 23h 33m * :59:59 9> ADM smw-elcapitan.mdh.quantum.com 0d 0h 0m N/A 17> CLI C smw-elcapitan.mdh.quantum.com 0d 0h 6m N/A 1 active connection out of licensed connections 0 active connections out of licensed proxy connections 1 active gateway connection 1 active client-licensed connection Xsanadmin (snfs1) > StorNext Storage Manager Known Issues Table 2 on the next page lists known issues specific to StorNext Storage Manager. StorNext 5 release Release Notes 12

13 Table 2: StorNext Storage Manager Known Issues Operating System Change Service Description/Workaround All File retrieves from media to disk can be suboptimal for fast tape drives like the Oracle STK T10K drives. This scenario can occur when the retrieve event is initiated on a host that is different from the host running the mover process, which requires the use of synchronous direct I/O. To work around this issue and achieve optimal performance for both file stores and retrieves with the T10K drives, increase the default I/O size used by the mover process and make the mover process use asynchronous buffered I/O when the use of synchronous direct I/O is not required, using the following steps: Note: This workaround may also help improve the performance of the faster LTO drives like LTO-6, and LTO-7 by updating the FS_ LTO_BLOCK_FACTOR sysparm. Note: Changes to FS_xxx_BLOCK_FACTOR only affects tapes formatted after the change. 1. Change the FS_T10K_BLOCK_FACTOR sysparm from 8 to 32 by adding the following entry to /usr/adic/tsm/config/fs_sysparm_override: FS_T10K_BLOCK_FACTOR=32; Note: The T10K default I/O block size is 512 KB or 8 * 64 KB. With the block factor changed to 32, the new T10K I/O block size will be 2 MB or 32 * 64 KB. Presently, the FS_T10K_BLOCK_FACTOR sysparm must not be set to a value that exceeds Restart Storage Manager to ensure the change in Step 1 goes into effect: # tsmstop # tsmstart 3. Verify the FS_T10K_BLOCK_FACTOR sysparm contains the new value: # showsysparm FS_T10K_BLOCK_FACTOR FS_T10K_BLOCK_FACTOR=32 4. Save the current copies of your /etc/fstab on the MDCs and the DDM clients. 5. Modify /etc/fstab on the MDCs and the DDM clients to use the auto_dma_write_length and auto_dma_read_length mount options as follows: snfs1 /stornext/snfs1 cvfs rw,auto_dma_write_length=16m,auto_dma_read_length=16m 0 StorNext 5 release Release Notes 13

14 Operating System Change Service Description/Workaround 0 6. Unmount and re-mount your file systems. 7. Use new T10K media to store a copy of the file from the disk. Note: Step 7 is very important; when the new copy is made to the new tapes, the new tapes are labeled with a 2 MB block size, which is used for subsequent writes or reads to and from the media. Tapes on which fsformat was run before the change will use the block factor in use at that time. This change will not impact those tapes. All n/a Executing the command snbackup -s while a full or partial backup is running may result in a message that /usr/adic/tsm/internal/locks/backup.lf is in an invalid format. This is due to the snbackup -s process reading the backup.lf status file while the backup process is updating it. Ignore the message; to clear-up the process, re-execute the command snbackup -s (provided that the backup is not writing to the backup.lf status file while snbackup -s is trying to read it again). All n/a When copying files between media using the CLI command fsmedcopy, the file is not re-segmented to match the segment size of the destination media. Rather, the original segments are copied to the target media type and the distribution of segments across destination media will, therefore, be the same as the distribution on the source media. Note: This behavior may cause file data segment distribution to be sub-optimal on the destination media. Currently, a workaround does not exist for this Known Issue. All n/a During StorNext Storage Manager start-up, SCSI Reservation conflicts may be reported by the IBM APFO driver if installed, particularly after involuntary fail-over of the StorNext MDC in High Availability configurations. These reservation conflicts can generally be ignored and cause no issues with StorNext Storage Manager. StorNext 5 release Release Notes 14

15 Operating System Change Service Description/Workaround Linux n/a When Storage Manager stores files to LTFS media, the fs_fmover process for TSM generates warning messages in the trace_05 files (found in the /usr/adic/tsm/log/trace directory) indicating that the fs_ fsmover process is unable to get the extended attributes on new files on the LTFS formatted media. The following is an example of the warning message: /usr/adic/tsm/logs/trace/trace_05 Oct 25 13:31: northern sntsm fs_fmover[22366]: E1201 (8)<02507>:mdt2ltfs1605: {1}: mdt2ltfs_file_get_attr: failed to get attr user.quantum_stornext_path on file /.StorNext/objects/00/00/01/ : These warning messages are safe to ignore for newly created files on the LTFS media. There may be up to four messages printed per LTFS file, one for each of the StorNext extended attributes on the LTFS media: QUANTUM_STORNEXT_PATH QUANTUM_STORNEXT_FKEY QUANTUM_STORNEXT_VERSION QUANTUM_STORNEXT_META_VERSION StorNext GUI Known Issues Table 3 on the next page lists known issues specific to the StorNext GUI. StorNext 5 release Release Notes 15

16 Table 3: StorNext GUI Known Issues Operating System Change Service Description/Workaround All n/a The possibility of having different NIC cards installed in the same slots across boots results in having the same Ethernet alias names being used for the network interfaces of different NICs with different speeds (1G/10G). However, the Ethernet alias names depicted in the StorNext Metrics GUI page do not reflect this possible change of the network device representing the alias. There is currently no workaround for Change Note: StorNext Metrics data is only kept for 30 days; the StorNext Metrics Report auto-corrects any port-discrepancies 30 days after the configuration is changed. StorNext 5 release Release Notes 16

17 Operating System Change Service Description/Workaround All n/a When the MDC is acting as a Distributed LAN gateway for a file system and its configuration is modified using the StorNext GUI or the Connect GUI, a spurious LAN server configuration file named /usr/cvfs/config/dpserver.<fsname> may be created if it does not already exist. This file will have all network interfaces enabled and overrides the main dpserver file, /usr/cvfs/config/dpserver. In some cases, having all network interfaces enabled is undesirable as it may result in sub-optimal DLC performance and cause DLC traffic to interfere with other MDC network traffic. Complete all configurations of the file system prior to setting diskproxy=server in the /etc/fstab file. Or, if the file system configuration requires modification after diskproxy=server has been set in the /etc/fstab file perform the following steps: 1. Execute the command sndpscfg -e to verify that /usr/cvfs/config/dpserver exists and contains correct information: # /usr/cvfs/bin/sndpscfg -e 2. Make /usr/cvfs/config/dpserver.<fsname> be a symbolic link to /usr/cvfs/config/dpserver: # /bin/rm -f /usr/cvfs/config/dpserver.<fsname> # ln -s /usr/cvfs/config/dpserver /usr/cvfs/config/dpserver.<fsname> 3. (Optional) Repeat Step 1 through Step 3 for all file systems for which the MDC is acting as a gateway and where /usr/cvfs/config/dpserver is used. StorNext 5 release Release Notes 17

18 Operating System Change Service Description/Workaround Linux n/a The Safari browser becomes unresponsive when you attempt to configure an server using the StorNext GUI. To workaround this issue, perform the following procedure: 1. Shut down the Safari browser window(s). 2. Restart the Safari browser, and then retry operation. 3. Uncheck the Verify SMTP Server Connectivity box, and then retry the operation. 4. Set Authentication to NONE, and then retry operation. 5. Disable the Safari User names and passwords AutoFill under Safari > Preferences > AutoFill, and then retry operation. StorNext Installation, Replication, HA, and Other Known Issues Table 4 on the next page lists known issues specific to StorNext installations, data replication, HA systems, and other areas. StorNext 5 release Release Notes 18

19 Table 4: StorNext Installation, Replication, HA and Other Known Issues Operating System Change Service Description/Workaround All n/a A database index named classndxatimeme will be automatically added to the tmdb.tier000files% and tmdb.tier001files% tables upon starting TSM for the first time after upgrading from StorNext or earlier. Note: The classndxatimeme index will already be present and not be added again if upgrading from StorNext or later. To minimize TSM downtime after upgrade, the classndxatimeme index can be created prior to performing the upgrade using the index_ tierfiles.pl PERL script. This file is available in the StorNext installation directoryby opening a support ticket and requesting the file. (Quantum service and service partners can obtain this file from the StorNext Metadata Appliances page on CSWeb.) The script can be run while TSM is running, although it may impact the performance of other operations while the index is being added to the database. To manually add the index, you must have the index_tierfiles.pl script. Then do the following: Log in to the primary server node, and access the command line of the system: 1. Log in to the primary server node. 2. Enter the following to source the profile:. /usr/adic/.profile 3. Change to the directory where install.stornext resides on the installation media. For example: cd /tmp/stornext/stornext_full/redhat60as_ 26x86_64 4. Verify that the database is up by running: mysql_control start StorNext 5 release Release Notes 19

20 Operating System Change Service Description/Workaround 5. Execute the PERL script:./tsm/index_tierfiles.pl The procedure is complete. All n/a When running StorNext replication from a deduplication-enabled StorNext filesystem to a deduplication-enabled HA StorNext filesystem, corruption is sometimes seen in files on the HA target if HA failovers occur during the replication. Attempts to read the contents of such files report EIO (5), input/output error. Examination of such files using snpolicy's report directive show no TAG or BLK_TAG_PRESENT flags in the file inode. It is not known if this problem is an alternate manifestation of CR 58814, which may also occur in these configurations. Avoid HA failovers/reconfiguration while StorNext replication of deduplicated files is active. See also the Release Note item for CR All n/a When running replication from a deduplicated file system to another deduplicated file system, corruption may occur in large files. Examination of the replicated files using snpolicy's report directive shows that there are holes in the replicated file's extended representation blobmap. These areas read as zeroes rather than the appropriate data. Avoid replicating deduplicated files, especially when deduplication is in progress. The problem is more likely to be seen on very large files (tens or hundreds of gigabytes or larger). It is also more likely to be seen when replication is run on a very short schedule (minutes). It is believed to occur mostly or only when deduplication and replication are running concurrently. StorNext 5 release Release Notes 20

21 Contacting Quantum Contacting Quantum Contacts For information about contacting Quantum, including Quantum office locations, go to: For further assistance, or for training opportunities, contact the Quantum Customer Support Center: Region North America EMEA Support Contact (toll free) (toll free) Asia Pacific (toll free) For worldwide support: Comments To provide comments or feedback about this document, or about other Quantum technical publications, send to: StorNext 5 release Release Notes 21

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